A landmark in ambition and scope, Cloud Atlas is basically six movies for the price of one. Like Darren Aronofsky’s The Fountain or that bit in The Tree Of Life with all the dinosaurs and the lava, directors Lana and Andy Wachowski and Tom Tykwer have set out to distil the very essence of existence itself for our cinematic pleasure. It charts the journey of different human souls across oceans and through time, but disentangling its inner ‘true true’ could take scholars many decades. Luckily, we've been able to augment our handy Cloud A-Z with a peek behind the curtain and asked two of its stars, James D'Arcy and Jim Sturgess, to tell is what it was like to make.